500 	unsigned int iter_head = i->head;  in data_start()  local
503 	if (off && (!allocated(&i->pipe->bufs[iter_head & p_mask]) ||  in data_start()
505 		iter_head++;  in data_start()
508 	*iter_headp = iter_head;  in data_start()
518 	unsigned int iter_head;  in push_pipe()  local
528 	data_start(i, &iter_head, &off);  in push_pipe()
529 	*iter_headp = iter_head;  in push_pipe()
534 			pipe->bufs[iter_head & p_mask].len += size;  in push_pipe()
537 		pipe->bufs[iter_head & p_mask].len = PAGE_SIZE;  in push_pipe()
538 		iter_head++;  in push_pipe()
540 	while (!pipe_full(iter_head, p_tail, pipe->max_usage)) {  in push_pipe()
541 		struct pipe_buffer *buf = &pipe->bufs[iter_head & p_mask];  in push_pipe()
552 		iter_head++;  in push_pipe()
553 		pipe->head = iter_head;  in push_pipe()
1282 				int iter_head,  in __pipe_get_pages()  argument
1287 	ssize_t n = push_pipe(i, maxsize, &iter_head, start);  in __pipe_get_pages()
1294 		get_page(*pages++ = pipe->bufs[iter_head & p_mask].page);  in __pipe_get_pages()
1295 		iter_head++;  in __pipe_get_pages()
1306 	unsigned int iter_head, npages;  in pipe_get_pages()  local
1315 	data_start(i, &iter_head, start);  in pipe_get_pages()
1317 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages()
1320 	return __pipe_get_pages(i, min(maxsize, capacity), pages, iter_head, start);  in pipe_get_pages()
1374 	unsigned int iter_head, npages;  in pipe_get_pages_alloc()  local
1383 	data_start(i, &iter_head, start);  in pipe_get_pages_alloc()
1385 	npages = pipe_space_for_user(iter_head, i->pipe->tail, i->pipe);  in pipe_get_pages_alloc()
1394 	n = __pipe_get_pages(i, maxsize, p, iter_head, start);  in pipe_get_pages_alloc()
1610 		unsigned int iter_head;  in iov_iter_npages()  local
1616 		data_start(i, &iter_head, &off);  in iov_iter_npages()
1618 		npages = pipe_space_for_user(iter_head, pipe->tail, pipe);  in iov_iter_npages()